AnuEa: Because there were no humans around at the time! If there...

AnuEa: Because there were no humans around at the time! If there were rainforests at the poles then you can be guaranteed that everywhere else on the planet would be uninhabitable. Including where you are right now. Your house, your street, your suburb, would be no longer, as with the rest of Australia and the world as we know it.

A lot of it would be under water anyway.

Not a good thought experiment to choose, in my opinion.

No one is predicting that to happen by the way, although with hypothetical feedback loops and runaway warming then all bets are off, I imagine.